GEIA Document blcarbon.txt 10 Oct 94

Inventory file blc85yr1.1a
blckCarbon1985 annual metric tons 1
Document: blcarbon.txt
Penner et al. 1993-Towards devel. BlkCarb:Atmos.Env., 27A, 1277-1295
Dignon et al. 1994-A black carbon emission data base for atmospheric chemistry and climate studies : LLNL Internal Report
Contact: J.E. Penner & H.E.Eddleman, L-262 J.Dignon, L-255
Lawrence Livermore Nat Lab, PO Box 808, Livermore, CA 94551

A Black Carbon Emission Data Base for Atmospheric Chemistry and Climate Studies
Jane Dignon, Harold E. Eddleman and Joyce E. Penner
University of California
Lawrence Livermore National Laboratory

DESCRIPTION
A global data base of black carbon emissions to the atmosphere from fossil fuel combustion has been compiled for the use in atmospheric chemistry and climate studies. The resolution provided is at 1degree latitude by 1degree longitude based on previous work by Matthews (1983), Lerner et al. (1988), and Dignon (1992). A more extensive description of the assumptions made and emission factors used in this data base can be found in Penner et al. (1993). The original work of Penner et al. (1993) provides the emissions inventory data on a 5degree by 5degree resolution.

The units of emission for this updated version of the inventory yield a global total of 12.6 TgC/y and are given as the mass in metric tons of carbon for each 1degree x 1degree grid. It is important to note that this is not equivalent to a flux, in that the area of the grid boxes vary latitudinally. The emissions are expected to represent the emissions for a typical mid-1980s year. The distribution of emission is based on national totals and then mapped on to the 1degree x 1degree grid according to the updated population mapping of Logan (1993). A description of this mapping procedure can be found in Dignon (1988). Figure. Data base array structure.

The grid for these data bases, (i,j) arrays, is (360,180), which represents 1 degree (lon,lat) resolution. Here, j=1,180 and j=1 represents the latitude band 90 degrees south to 89 degrees, i.e. centered at 89.5 degrees south; j=180 represents the band from 89 degrees north to 90 degrees north, i.e. centered at 89.5 degrees north. Longitude is represented as i=1,360, where i=1 represents the band from 180 degrees (international date line) to 179 degrees west, i.e. centered at 179.5 degrees west; i=360 is the band from 179 degrees east to 180 degrees (date line), i.e. centered at 179.5 degrees east. The accompanying Figure illustrates the structure of the arrays.

ACKNOWLEDGEMENTS: Work performed under the auspices of the U.S. Department of Energy by the Lawrence Livermore National Laboratory under contract No. W-7405-Eng-48.

REFERENCES:

Dignon, J., 1988. Time and Spatially Dependent Estimates of Pollutant Trace Gas Emissions and their Effect on Tropospheric Ozone, Doctoral Dissertation, State University of New York at Stony Brook.

Dignon, J., 1992: NOx and SOx emissions from fossil fuels: A global distribution, Atmospheric Environment, 26A, 1157-1163.

Lerner, J, E., E. Matthews, and I. Fung 1988: Methane emission from animals: A global high resolution data base, Global Biogeochemical Cycles, 2, 139-156.

Logan, J.A., 1993: manuscript in preparation, for population.

Matthews, E., 1983: Global vegetation and land use: New high-resolution data bases for climate studies, Journal of Climate and Applied Meteorology, 22, 474-487.

Penner, J.E., H.E. Eddleman and T. Novakov, 1993: Towards the development of a global inventory of black carbon emissions, Atmospheric Environment, 27A, 1277-1295.